Graccillariidea is a collection of leaves that are affected by leafminers. Leafminers make a way through the veins, the architecture of the leafs. This creates a 'choreography of the leafminers'. Cools is working with a choreographer to translate it into a choreography performed by humans. The leaves shown are part of the complete collection. The collection is supplemented every spring and autumn during expeditions that Cools undertakes in the Netherlands and abroad.